San Jose (2-3-5) has tied four of the past five matches and is winless in six straight games.

Mapp opened the scoring with a 30-yard shot that pinged in off the near post, then made it 2-0 with an open tap-in at the far post, set up by Andrew Wenger’s short pass across the face of the goal.

The performance capped a stellar week for Mapp, who also had a goal and an assist Wednesday in the Impact’s 6-0 romp over Toronto FC during a Canadian Championship semifinal.

San Jose dominated play early, only to be kept off the scoreboard by some stellar work from Montreal goalkeeper Troy Perkins.

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The Earthquakes opened the scoring when Jahn placed a left-footed shot from 10 yards to the far post, finishing off a sequence that began with passes from Marvin Chavez, Wondolowski, and Cronin.

Midfielder Walter Martinez and forward Marcus Tracy made their MLS debuts for San Jose in the final half-hour, and it made a difference. Justin Morrow fed a ball back to Martinez in the 91st minute, and it was Martinez’s long ball that Wondolowski knocked down into Cronin’s lap.

Sounders 2, Union 2 — Mauro Rosales scored a goal in the 64th minute to give Seattle a draw on the road against Philadelphia.

Danny Cruz scored twice for the Union (3-3-3), who remained undefeated at home, but probably expected better against the Sounders.

After Rosales got the equalizer for Seattle (1-3-3), the match got chippy. Seattle’s Lamar Neagle and Philadelphia’s Sheanon Williams were shown red cards in the 85th minute following a scuffle.